当院にてリバース型人工肩関節置換術（RSA）を施行した53例55肩に対し，RSA合併症の一つであるscapular notchingの発生頻度を調査した．また，notchingあり群となし群に分け，年齢，性別，BMI，観察期間，機種別（In-layとOn-lay），術後臨床成績，肩関節自動可動域について両群間で比較検討した．scapular notchingの発生頻度は8肩（14.5％）であり，年齢，性別，BMI，術後経過観察期間において差を認めなかった．In-lay type 22肩中5肩（22.7％），On-lay 33肩中3肩（9.1％）に認め，機種間での発生に差を認めなかった．また，両群ともJOAスコア，肩関節自動屈曲・外転では術前後で改善を認めたが，内外旋では変化を認めなかった．群間比較では，術前後のJOAスコア，肩関節自動可動域に変化を認めなかった．

BACKGROUND In a previous biomechanical study, eccentric glenospheres with more inferior position of the center of rotation were shown to improve range of motion and reduce the incidence of scapular notching after reverse total shoulder arthroplasty (RSA). The purpose of this study was to compare the clinical and radiological results of RSA using an eccentric glenosphere to those using a concent...

BACKGROUND Different implant designs are utilized in reverse shoulder arthroplasty. The purpose of this systematic review was to evaluate the results of reverse shoulder arthroplasty using a traditional (Grammont) prosthesis and a lateralized prosthesis for the treatment of cuff tear arthropathy and massive irreparable rotator cuff tears. METHODS A systematic review of the literature was perf...

BACKGROUND Lateral offset center of rotation (COR) reduces the incidence of scapular notching and potentially increases external rotation range of motion (ROM) after reverse total shoulder arthroplasty (rTSA). The purpose of this study was to determine the biomechanical effects of changing COR on abduction and external rotation ROM, deltoid abduction force, and joint stability. MATERIALS AND ...

The purpose of this retrospective study was to assess the effect of the reduced medialisation of the Arrow reverse shoulder prosthesis on short-term clinical and radiological results. The clinical and radiological results of 47 Delta III reverse prostheses and 49 Arrow reverse prostheses were retrospectively compared at a minimum of twelve months follow-up. There was a significant increase (p <...